|
|
|
|
|||
By |
||||
April 2, 2010 -
The National Transportation Safety Board will hold a public Board
meeting on its investigation into an accident in which a chartered
business jet crashed during a rejected takeoff in The purpose of
the meeting will be to determine the probable cause of the accident and
to consider proposed safety recommendations to reduce the likelihood of
future such mishaps. On September
19, 2008, at about 11:53 p.m. EDT, a Learjet Model 60 (N999LJ) overran
runway 11 while departing Columbia Metropolitan Airport (CAE), |
||||
Tire debris and portions of airplane components were found along the
8,600 foot runway. According to witnesses and initial information, the
beginning of the takeoff roll appeared normal, then sparks were observed
as the airplane traveled along the runway.
At about 136 knots, the crew attempted to reject the takeoff, however
they were unable to stop the airplane before exiting the runway. The
airplane continued beyond the runway blast pad and through the
approximately 1,000 foot runway safety area while striking airport
lighting, navigation facilities, a perimeter fence and concrete marker
posts. The airplane then crossed a roadway and came to rest where it
struck an embankment on the far side of the road.
The 2 crewmembers and 2 of the 4 passengers were killed, the other 2
passengers suffered serious injuries. The aircraft was destroyed by
extensive post-crash fire. There was also damage to the airport
lighting, a navigation antenna array; and perimeter fencing.
The pilot held an Airline Transport Pilot certificate with a Lear 60
type rating and had logged approximately 3,140 hours total flight time
and approximately 35 hours in Lear 60 airplanes. The accident First
Officer held an Airline Transport Pilot certificate with a Lear 60 type
rating and had logged approximately 8,200 hours total flight time and
approximately 300 hours in Lear 60 airplanes. |
The Learjet
model 60 is a twin engine business jet with a nominal 8 passenger
capacity. Records shows the date of manufacture for N999LJ was January
30, 2007. The airplane was purchased by the current owner on October 25,
2007 and the operator began to use the airplane for charter flights
about six weeks before the accident. The airplane had logged less than
120 flight hours total. The airplane was equipped with two Pratt &
Whitney A Special
weather observation taken by the control tower at the time of the
accident indicated the winds were from 060 degrees at 7 knots,
visibility was 10 statute miles under clear skies, temperature 19
degrees Celsius, dewpoint 13 degrees Celsius, and the sea level
barometric pressure was 30.23 inches of mercury. Columbia
Metropolitan Airport Runway 11/29 was 8601 feet in length and 150 feet
in width with a grooved asphalt surface. The runway safety area was
1,000 feet in length and 500 feet in width. At the time of the accident,
the intersecting runway (05/23) was 8,001 feet in length and 150 feet in
width, and was closed due to construction. The airplane
came to rest along a southeasterly orientation, nose-up on the side of a
hill of approximately 25-30 degree slope. With the exception of all
three landing gear, right delta fin, and right wing flap, all major
airplane assemblies were found in the expected orientations. The top and
right side of the fuselage had burned away to about the level of the
cabin floor. The aft fuselage was mostly consumed by fire as far aft as
the localizer antenna on the vertical stabilizer. The first piece
of tire debris was observed about 2300 feet from the departure end of
runway 11. Numerous other piece of tire debris were located along the
runway. Prior to the first piece of tire, five small pieces of broken
taxiway reflector adhesive were found. Tire and skid marks could be
followed on the runway and were spaced 100 inches apart (8? 4?)
consistent with the spacing between the centers of the inboard left and
outboard right wheels. Before reaching about 3400 foot of remaining
runway, the left and right main gear tire rims scarred the runway
surface. The marks led
past the runway and through four rows of gravel at the bases of the
instrument landing system antenna components. Approximately 150 feet
past the end of the pavement, near the first set of lights, the main
landing gear pistons and wheel sets with the brake assemblies were
found. The right main landing gear (squat) micro-switch was found on the
grass near the main landing gear with short pieces of wire remaining.
The left squat switch was also found on the grass, but with no wires. The wheel sets
were found with very little rubber other than tire beads attached.
Grinding and friction damage was evident on all wheel and brake
assemblies, with the most severe damage on the right outboard, and
diminishing somewhat across to the left outboard. The right outboard
wheel halves had the edges of both bead flanges ground completely away.
The tire beads were missing. The general bottom features of the brake
assembly were ground flat and the bottom of the ground area of the
assembly exhibited heat-bluing. The hydraulic lines had extensive
damage. Preliminary
examination of the right PW305A engine revealed that the accident
exposed inlet guide vanes (IGV) and reference to a manufacturer?s chart
showed the orientations were consistent with high power. The thrust
reversers were in the retracted/stowed orientations. The main cabin
door was found closed and latched. The aft exit and fuselage area was
destroyed by fire, however, the exit handle and one pin-type latch were
found in debris. Both were in the open or unlatched position. One of the
surviving passengers reported no difficulty opening the exit. The operator,
Global Exec Aviation, was established in 2002, in Parties to the
investigation include the FAA, Learjet, Global Exec Aviation, Pratt and
Whitney Canada, TSB-Canada, and Goodyear. The meeting will be held in
Washington on Tuesday, April 6, 2010, at 9:30 a.m. ET, in the NTSB Board
Room and Conference Center at 429 L'Enfant Plaza, S.W. A live and
archived webcast of the proceedings will be available on the NTSB's
website. A summary of
the Board's final report, which will include its findings, probable
cause and safety recommendations, will appear on the website shortly
after the conclusion of the meeting. The entire report will appear on
the website several weeks later.
|
?AvStop Online Magazine Contact Us Return To News |
|